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package roadrunner
import (
"sync"
"time"
)
const (
// EventStderrOutput - is triggered when worker sends data into stderr. The context
// is error message ([]byte).
EventStderrOutput = 1900
// WaitDuration - for how long error buffer should attempt to aggregate error messages
// before merging output together since lastError update (required to keep error update together).
WaitDuration = 100 * time.Millisecond
)
// thread safe errBuffer
type errBuffer struct {
mu sync.Mutex
buf []byte
last int
wait *time.Timer
update chan interface{}
stop chan interface{}
lsn func(event int, ctx interface{})
}
func newErrBuffer() *errBuffer {
eb := &errBuffer{
buf: make([]byte, 0),
update: make(chan interface{}),
wait: time.NewTimer(WaitDuration),
stop: make(chan interface{}),
}
go func() {
for {
select {
case <-eb.update:
eb.wait.Reset(WaitDuration)
case <-eb.wait.C:
eb.mu.Lock()
if len(eb.buf) > eb.last {
if eb.lsn != nil {
eb.lsn(EventStderrOutput, eb.buf[eb.last:])
eb.buf = eb.buf[0:0]
}
eb.last = len(eb.buf)
}
eb.mu.Unlock()
case <-eb.stop:
eb.wait.Stop()
eb.mu.Lock()
if len(eb.buf) > eb.last {
if eb.lsn != nil {
eb.lsn(EventStderrOutput, eb.buf[eb.last:])
}
eb.last = len(eb.buf)
}
eb.mu.Unlock()
return
}
}
}()
return eb
}
// Listen attaches error stream even listener.
func (eb *errBuffer) Listen(l func(event int, ctx interface{})) {
eb.mu.Lock()
eb.lsn = l
eb.mu.Unlock()
}
// Len returns the number of buf of the unread portion of the errBuffer;
// buf.Len() == len(buf.Bytes()).
func (eb *errBuffer) Len() int {
eb.mu.Lock()
defer eb.mu.Unlock()
// currently active message
return len(eb.buf)
}
// Write appends the contents of pool to the errBuffer, growing the errBuffer as
// needed. The return value n is the length of pool; err is always nil.
func (eb *errBuffer) Write(p []byte) (int, error) {
eb.mu.Lock()
eb.buf = append(eb.buf, p...)
eb.update <- nil
eb.mu.Unlock()
return len(p), nil
}
// Strings fetches all errBuffer data into string.
func (eb *errBuffer) String() string {
eb.mu.Lock()
defer eb.mu.Unlock()
return string(eb.buf)
}
// Close aggregation timer.
func (eb *errBuffer) Close() error {
close(eb.stop)
return nil
}
|
